Support base for a heater



FIG. 1 is a perspective view of a support base for a heater showing my new design;

FIG. 2 is a front elevational view thereof, the side elevations and the rear elevation being the same as that shown;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken line showing of environmental structure in FIGS. 1-4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a support base for a heater, as shown and described. 